linux-kernel - Re: [PATCH 0/4] tools/nolibc: add testcases for vfprintf

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:   Tue, 4 Apr 2023 13:48:36 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Willy Tarreau <w@....eu>
Cc:     linux@...ssschuh.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/4] tools/nolibc: add testcases for vfprintf

On Tue, Apr 04, 2023 at 10:46:23PM +0200, Willy Tarreau wrote:
> On Tue, Apr 04, 2023 at 01:40:32PM -0700, Paul E. McKenney wrote:
> > On Sun, Apr 02, 2023 at 02:24:04PM -0700, Paul E. McKenney wrote:
> > > On Sun, Apr 02, 2023 at 08:48:02PM +0200, Willy Tarreau wrote:
> > > > Hello Paul,
> > > > 
> > > > Thomas added new tests for vfprintf(), which is a good idea because it
> > > > was a new implementation, we use it a lot in the tests so we'd rather
> > > > make sure it works! This required to implement support for memfd_create()
> > > > that is used to collect the output into a buffer, as well as to complete
> > > > a little bit the minimalistic FILE emulation with fileno(), fdopen(),
> > > > fflush() and fclose(). The result is neat and works equally on glibc and
> > > > nolibc. We just had to cheat on the pointer test because for NULL nolibc
> > > > prints "0x0" while glibc prints "(nil)" so we check 0x1 instead to avoid
> > > > this special case.
> > > > 
> > > > Finally Thomas added a new target to the makefile to ease building the
> > > > test against the default libc. This should help detect incompatibilities
> > > > when new features are added.
> > > > 
> > > > I've tested it locally with my libc and against all supported architectures
> > > > (userland tests only), and all tests passed.
> > > > 
> > > > This can be added to your dev tree for 6.5 on top of the previous series.
> > > 
> > > Looks like some useful code to make testing more comprehensive, thank
> > > you both!  Queued and pushed.
> > 
> > And finally tested:
> > 
> > Kernel: arch/x86/boot/bzImage is ready  (#7)
> > make[1]: Leaving directory '/home/git/linux-build'
> > 133 test(s) passed.
> > 
> >   CC      nolibc-test
> > 133 test(s) passed.
> > 
> > So good agreement between user and kernel, anyway.  Usermode tests
> > note that two of the tests are skipped (chroot_root and link_blah).
> > Kernelmode tests all say "[OK]".
> 
> This is perfect, thank you Paul!
> 
> Eventually I'll clean up my test script I use to build and test for all
> archs, and commit it to help with such testing.

Thank you for confirming the test results!

							Thanx, Paul